51497621723 has 2 divisors, whose sum is σ = 51497621724. Its totient is φ = 51497621722.

The previous prime is 51497621701. The next prime is 51497621767. The reversal of 51497621723 is 32712679415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51497621723 - 2¹⁸ = 51497359579 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (51497620723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25748810861 + 25748810862.

It is an arithmetic number, because the mean of its divisors is an integer number (25748810862).

Almost surely, 2^51497621723 is an apocalyptic number.

51497621723 is a deficient number, since it is larger than the sum of its proper divisors (1).

51497621723 is an equidigital number, since it uses as much as digits as its factorization.

51497621723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 47.

The spelling of 51497621723 in words is "fifty-one billion, four hundred ninety-seven million, six hundred twenty-one thousand, seven hundred twenty-three".